Description: Transposition of a two-argument mapping. (Contributed by Mario Carneiro, 10-Sep-2015)
Ref | Expression | ||
---|---|---|---|
Hypothesis | tposmpo.1 | |
|
Assertion | tposmpo | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tposmpo.1 | |
|
2 | df-mpo | |
|
3 | ancom | |
|
4 | 3 | anbi1i | |
5 | 4 | oprabbii | |
6 | 1 2 5 | 3eqtri | |
7 | 6 | tposoprab | |
8 | df-mpo | |
|
9 | 7 8 | eqtr4i | |